derail

verb

de·​rail di-ˈrāl How to pronounce derail (audio)
dē-
derailed; derailing; derails

transitive verb

1
: to cause to run off the rails
2
a
: to obstruct the progress of : frustrate
security problems derailed the tour
b
: to upset the stability or composure of
divorce … can seriously derail an employeeJoanne Gordon

intransitive verb

: to leave the rails
derailment noun

Examples of derail in a Sentence

The train derailed in heavy snow. The train was derailed by heavy snow.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Could SpaceX derail a rival's next-generation satellite project because of paperwork issues? Michael Kan, PC Magazine, 3 June 2025 However, the Trump administration’s announcement of sky-high tariffs on China in April derailed this process. Ramishah Maruf, CNN Money, 3 June 2025 By the time Trump met Kim for a second summit in Hanoi, Trump’s attention had drifted from North Korea, and both men’s greed for a quick deal derailed their fragile progress. John Delury, Foreign Affairs, 3 June 2025 In Kursk, a freight train derailed after a bridge fell, injuring a crew member. Katya Soldak, Forbes.com, 2 June 2025 See All Example Sentences for derail

Word History

Etymology

French dérailler to throw off the track, from dé- de- + rail, from English

First Known Use

1850, in the meaning defined at transitive sense 1

Time Traveler
The first known use of derail was in 1850

Browse Nearby Words

Cite this Entry

“Derail.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/derail. Accessed 6 Jun. 2025.

Kids Definition

derail

verb
de·​rail di-ˈrā(ə)l How to pronounce derail (audio)
: to cause to run off the rails
a train derailed by heavy snow
derailment noun

More from Merriam-Webster on derail

Last Updated: - Updated example sentences
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